https://support.google.com/photos/answer/6220791?hl=en&ref_topic=6156061&sjid=7287807973876276258-NA# https://support.google.com/photos/answer/6220791?hl=en&ref

https://support.google.com/photos/answer/6220791?hl=en&ref_topic=6156061&sjid=7287807973876276258-NA# https://support.google.com/photos/answer/6220791?hl=en&ref_t... According to this support article, you can store original quality. Assuming that is what you meant by "lossless".